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Let's not forget the massive pain that /dev/urandom being a file was, that they had to add a syscall for it: getrandom()

I thought that the issue with /dev/urandom was that it wouldn't block when read shortly after startup (when the entropy pool wasn't yet initialized).

That's part of it. Another concern was ensuring that fetching a random number couldn't fail due to file descriptor exhaustion. [1]

Likewise, it would be nice if on ARMv7 one could figure out if NEON is available without having to have permission to open a file under /proc.